WIP chore(*): introduce additional scopes for testing different AJS versions

Usage: ```TEST_SCOPE=angular_1.3.x grunt test```

Run `grunt install-test` ensure all scopes' dependencies are fully available.

Travis/CI will run multiple times (defined in travis.yaml).

```sh
TEST_SCOPE= npm test
TEST_SCOPE=angular_1.0.x npm test
TEST_SCOPE=angular_1.2.x npm test
TEST_SCOPE=angular_1.3.x npm test
```

This will fail atm because of unresolved issues in different versions.